Degradation Processes in Corona-Charged Electret Filter-Media

• Main Authors: Warren J. Jasper, Ph.D, Roger Barker, Ph.D., Anushree Mohan, Juan Hinestroza, Ph.D.
• Format: Article
• Language: English
• Published: SAGE Publishing 2007-12-01
• Series: Journal of Engineered Fibers and Fabrics
• Online Access: http://www.jeffjournal.org/papers/Volume2/Jasper7-5R1.pdf

The degradation of filtration performance for coronachargedelectret filter media exposed to ethyl benzenewas assessed. Nonwoven corona-charged polypropylenefiber mats were exposed to ethyl-benzene using acustom made apparatus. Evaluated scenarios includedethyl-benzene vapor and liquid exposures. The filtrationperformance was evaluated using DOP as a testaerosol to measure filtration performance. It was observedthat significant filtration degradation occurredonly when liquid ethyl benzene came into direct contactwith the filter media. No significant changes in thepressure drop or filtration efficiency was observed forany of the exposure scenarios in which the fibers wereonly exposed to ethyl benzene in the vapor phase.